What would indicate a malfunctioning fuel temperature sensor?

Abnormal temperature readings would indicate a malfunctioning fuel temperature sensor because the primary function of this sensor is to accurately measure the temperature of the fuel. If the sensor is functioning properly, it should provide stable and accurate temperature readings that reflect the actual conditions of the fuel system.

When the sensor begins to fail, it may produce incorrect readings that deviate from expected values. This could manifest as either excessively high or low temperature readings that do not correlate with the actual fuel temperature, which can lead to improper fuel management, engine performance issues, or even potential damage.

While the other options may indicate other issues in the fuel system, they do not specifically point to a fault in the temperature sensor itself. For instance, low fuel pressure can be influenced by other factors such as fuel blockages or pump failures, and the fuel feed light illumination may be related to fuel availability or pressure rather than temperature readings. Therefore, abnormal temperature readings are the most direct indicator that the fuel temperature sensor is malfunctioning.